Due to the new algorithms for what blocks to render, being underground in spectator mode is useless. I recommend that you make it so that spectator mode renders all block faces adjacent to air (like previously).
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It is not a change to spectator mode. Spectator mode is affected because you can be in blocks, which, causes the rendering algorithm to find no block faces to render. I will provide screenshots though.
Can confirm for the lastest (30c) snapshot. It is a little intermittent, though, since you can see caves if you're just below the surface. I attached 4 screenshots above (first time using JIRA - don't think I added it quite right) which shows two "bottom shots" (looking up from the bottom of the 50x50 area I'm playing in). The 2nd is from the top, looking down. (when I didn't have that 3x3 shaft in the middle, I couldn't see anything).
To reproduce -
1. Type /gamemode 3
2. Fly around under the ground.
Observed Result - Not all caves are visible (unless you're right next to them).
One reason I liked gamemode 3 was so I could start a challenge map right over top of, say, a skeleton spawner, or to view someone's underground base from a game save.
(Hmm, thought my Minecraft username would show. oh well)
Cannot confirm any changes to Spectator Mode, plese provide Screenshots.